In this paper, the NRTL equation approach has been used for calculating the activity coefficient and excess Gibbs free energy of the binary alloy system involving two-liquid coexisting phases. The parameters needed for the calculation are the differences of interaction energies (g12-g22), (g21-g11) and nonrandomness constant α, which are determined by solving NRTL equation with the aid of genetic algorithm. The calculation is carried out numerically for Al-In system. The agreement between the calculated and experimentally determined values of activity coefficient and excess Gibbs free energy is rather good, indicating the validity of the NRTL equation for the description of two-liquid coexisting phase alloy systems.
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